Throttle valve



W. F. KASPER.

THROTTLE vA'LvE.

MPLlCATlON FILED MAR. l2. 1920.

Paente uy 25, 1922.A

ill

THRo'r'rLE VALVE.

Masses.

.suitable source,

Be it lknown that I,'VVALTER F. KASPER, a citizen of the' United States, resident of Fairmont, county of Martin, State of Mine nesota, have invented certain new and useful Improvements in Throttle Valves, of which the following is a. specification.

lV y invention relates to throttle valves for internal combustion engines of the t\vo.

cycle type in which a combustible-charge is admitted and compress d in the crank chamber of the engine and thereafter transferred, through 'a by-pass, and tion cylinder. In this type of engine it is diiicult to secureuniform distribution of the combustible gas when it enters the combustion cylinder withthe result that missing takes place, especially when the engine is throttled down for lower speeds and lighter loads. 4 The object of theinvention is, therefore, to provide, means in connection withv a throttle valve for securing more uniform distribution Yin the combustion cylinder of the entering combustible for all loads and speeds ofthe engine, and particularly to so direct the gas stream to procure a richer mixture at, or near the spark plug origination point when the engine is throttled down, thus insuring positive ignition vof lean charges when idling the engine at a low speed and preventing misring. p

My invention consists in certain constructions and combinations, all as hereinafter described and particularly pointed outA in the claims, taken'in connection with the accompanying drawings, in which Figure l is a longitudinal vertical section of a two cycle engine having my inven-` tion applied thereto,

igure 2 is a transverse .section of the engine on the line 2`2 of Figure l,

Figure 3 is a perspective view-of the throttle valve constructed according to my invention,

.Figure et is a detail section illustrating the method of throttling.

In the drawings, 5 is the crank chamber into which is drawn a combustible mixture of gas through a check valve from any such as a carbureter (not shown). 7 is the crank shaft, 8 the connectin rod to the piston l0 operating in the cy inder ll and having a -bale plate member ,I specification of Lettersratent. application ined March 12,` 1920. serial port to the combusthe combustion chamber 13.,

through a by-pass becomes the exhaust gases, thus making the mixture difficult of ignition.

To overcome this defect, I mount a rotary throttle valve 20 in a housing or seat 21 in` close proximity to the intake port 17, the valve having gas tight seats 22 and 23 in heads 24 and 25 and annular seats 26 and 27 at its ends. This method of induction prevents the mixing or diffusion of the combustible gas with the exhaust gases and localizes the gases around the spark plug where it will be readily ignited. The advantage of this valve construction lies generally in .the fact that as the charge is throttled, the

Itwill be understood that any number of i steps may be provided and other equivalent Patented may es, ieaa and fdeepest 'recess the port `construction of the valve substituted Without departing from the-scope or the invention. 's

The central recess principle of I claim as my invention:

1. A throttle valve vfor a two-cycle iii- 'ternal combustion engine comprising a cylindrical valve body having a segmental longitudinal Iport and stepped peripheral recesses in the Walls of said port, said recesses diering' in length and depth, the shortest being vcentrally arranged 'vith respect to'saidport.

2. A throttle valve eforfa two-cycle intern-al combustion engine comprisingl a Acylindrical val-vebody .having a segmental longitudinal port, one side of said port being substantially parallel to the valve body and the opposite side of said port being recessed progressively deeper towards its center from both ends of said port.'

3. A throttle valve for a two-cycle engine comprising a rocking cylindrical valve body having .a longitudinal segmental port open ing and a recess stepped from both ends of opening for longitudinally con Leases@ tracting or extending-the length said "port opening when said valve is'rocked. y

. 4. A; throttle fora two-cycle engineeomv having a longitudinal segmental portv open#v ing therein, a wallof said port opening hav-- ing a series of recesses progressively shorter and stepped deeper from the ends toward the center of said port opening.

5. A throttle valve-for a two cycle inLA ternal combustionengine comprising a rotatable cylindrical valve having a segmental port along one side, said port having an arcuate bottom Wall, and a shorter port formed in one edge of the segmental port and having an arcuate bottom wall merging into the bottom Wall of the first port at' a point intermediate its side edges.

6.' A.' throttle valve for a two cycle internal combustion engine, comprising a rotatable cylindrical valve having a segmental port along one side, said port having an arcuatebottom wall, and a plurality of ports progressively decreasing in length and iiicreasing iii depth from the opposite ends of the segmental port and formed in one side edge thereof, the bottom Walls of the second ports, being arcuate and merging into the ottom wall of the first port in progressively spaced order from said side edge thereof.4

In Witness whereof, I have. hereunto set my hand this 8 day of March 1920.

g WALTERF. inisrnii. Witnesses:

Wiifrianor F. COLLIER, CLAIRE O. BABooCK.

4o@ n prising a rocking cylindrical valve body- 

